Burner port lining for soaking pit and method of construction



March 29, 1955 F. J. PIKus 2,705,138

BURNER PORT LINING FoR soAKING PIT AND METHOD oF coNsTRucTIoN Filed April 14, 1954 /i 50 ZA/J2 50' BURNER PORT LINING FOR SOAKING PIT AND METHOD F CONSTRUCTION Frank J. Pikus, Orem, Utah, assignor to United States Steel Corporation, a corporation of New Jersey Application April 14, 1954, Serial No. 423,052 4 Claims. (Cl. 266-43) The present invention relates to an improved gas port structure for bottom tired ingot soaking pits.

As may be seen in the patent to Morton, No. 2,124,888, the conventional bottom tired ngot soaking pit or furnace utilized in modern steel mills is provided with a refractory bottom having a centrally located burner port therein. A layer of loose granular material, such as coke breeze, on the refractory bottom forms the hearth of the soaking pit for supporting the ingots. The burner port lining projects above the level of the layer of loose material in order to prevent particles thereof from falling into the Ingot soaking pits are operated at temperatures suicient to heat the ingots to their proper rolling temperature which ordinarily ranges from about 2150 to 2450 F. Since the burner port lining is exposed directly to the full temperature of the burner, it wears in a relatively short time and must be replaced at frequent intervals even when not damaged by physical impact.

Accordingly, it is an object of my invention to provide an improved burner port lining construction which is long wearing and highly resistant to damage by physical impact and a method of making the same.

It is a further object of the invention to provide an improved burner port lining construction which may be substantially Prefabricated and easily and quickly installed in a bottom lire ingot soaking pit.

These and other objects will become more apparent after referring to the following specification and attached drawings, in which:

Figure 1 is a vertical sectional view of the prefabricated burner port lining of the invention before installation in a soaking pit;

Figure 2 is a view similar to Figure l showing the burner port lining of the invention completely installed in a soaking pit;

Figure 3 is a plan view of the bottom plate element of the invention with lifting eyes attached; and

Figure 4 is a sectional view taken on the line IV-IV of Figure 3 showing the mode of attachment of a lifting eye to the bottom plate.

Referring more particularly to the drawings, reference numeral 2 designates a bottom tired ingot soaking pit having a refractory brick bottom 4, a center burner port 6 and a hearth 8 consisting of loose granular material such as coke breeze or the like. Reference numerall indicates generally the burner port lining construction of my invention.

The burner port lining 10 is Prefabricated in a manner to be hereinafter described and consists of a steel bottom plate 12 having a center hole 14 therethrough and a brickwork construction 16 projecting upwardly from the bottom plate to a point above the level of the hearth 8. The center of the brickwork 16 consists of a filling of cast iron 18. The top 20 and the outer periphery 22 of the brickwork 16 are covered with a layer 24 of plastic refractory, such as plastic chrome or similar material.

The lining 10 is fabricated outside of the soaking pit by laying chrome-magnesite brick on the steel plate 12 to form two spaced vertical walls 26 around the hole 14 with a space 28 between the walls. The space 28 is then lled with the molten cast iron 18. I have found it preferable to arrange the brick in each of the walls 26 in staggered relation so as to define a vertically irregular As shown in Figures l, 3 and 4, lifting eyes 30 are aiiixed to the portion of the steel= plate 12 immediately surrounding the hole 14 by means' of nuts 32 which are welded to the plate. After the molten cast iron 18 has solidified in the space 28, the lining 10 is lifted by attaching the lift cables of an overhead cranel (not shown) is deposited of the soaking pit. After the lining has been positioned in the soaking pit, the portion of the bottom plate 12 surrounding the hole 14 on which the lifting eyes and the nuts 32 are aiiixed is burned oif with a cutting torch. The cut-off line is indicated by dot and dash line C in Figure 3. hole 14 so that it is substantially equal to the diameter of the burner port 6. As a nal operation, a layer of plastic-chrome material is applied to the top 20 and outer periphery 22 of the brickwork 16.

As the molten cast iron filling 18 is poured, the iron penetrates between the slightly so that a strong bond is produced which is of greater strength than that created by the use of conventional mortar. The brickwork structure 16 is not bonded to the bottom plate 12 but remains in position by virtue of its weight.

While the soaking pit is operating, the heat from the burner has a tendency to liquify the surfaces of the cast iron filling causing it to react chemically with the abutting surfaces of the brickwork, thereby forming a magnesio-ferrite bond having gr'ater strength and resistance to heat than cast iron alone.

While one embodiment the scope of the I clalm:

cally lrregular space between the wall No references cited. 

1. IN A SOAKING PIT HAVING A REFRACTORY BOTTOM CONTAINING A BURNER PORT, AND A LAYER OF LOOSE MATERIAL ON SAID REFRACTORY BOTTOM, THE IMPROVEMENT THEREWITH OF A HORIZONTALLY DISPOSED STEEL PLATE SURROUNDING SAID BURNER PORT BELOW THE LEVEL OF SAID REFRACTORY BOTTOM, A REFRACTORY BRICKWORK ON SAID PLATE EXTENDING UPWARDLY TO A POINT ABOVE SAID LAYER OF LOOSE MATERIAL, SAID BRICKWORK INCLUDING TWO SPACED WALLS OF BRICKS DEFINING A VERTICAL SPACE THEREBETWEEN, A CAST IRON FILLING IN SAID SPACE, AND A LAYER OF PLASTIC REFRACTORY AROUND THE TOP AND OUTER PERIPHERY OF SAID BRICKWORK. 